Photoelectrochemistry at Bipolar Semiconductor Electrodes

Photoelectrochemistry may be performed on semiconductor wafers without application of metal contacts, using a cell in which the semiconductor sample is clamped between two suitable electrolytic solutions. Electrochemical control is obtained by applying a potential difference between two metal electrodes inserted in the solutions. The possibilities of semiconductor characterization and processing are discussed for InP and GaAs, using I-/I3- solutions for the back electrolytic contact.